Ignition system for internal-combustion engines



Dec. 7, 1948. I M. IMALLORY 2,455,594

IGNITION SYSTEM FOR INTERNAL-COMBUSTION ENGINES Filed May '7, 1945 INVENTOR. Mar/an Mafia/y 73km. i514,

Patented Dec. 7, 1948 OFFICE IGNITION SYSTEM FOR COMBUSTION EN GINES Marion Mallory, Detroit, Mich. Application May 1, 1945, Serial m. 592,364 3 Claims. (or 123-117) This invention relates to an ignition timing control means for an internal combustion engine and in particular to an internal combustion engine which'has an automatically operated governor throttle valve located between the throttle valve of the carburetor and the engine.

It is an object of this invention to produce an 7 The figure shows a sectional view partly in elevation showing the mechanism of my ignition timing control means for internal combustion engines.

The parts of my invention illustrated in the drawing are referenced as follows: carburetor I; intake passageway 2 having inlet- 3 and outlet 4 to the engine, venturi S, manually controlled throttle valve I 01' the butterfly type, tvalve shaft 1, governor throttlevalve- 8 of the butterfly type", governor valve shaft 9, orifice ID in the venturi, orifice ll adjacent to and on the engine side of throttle valve 8 when in idle position, orifice I! on the engine side of governor valve 8, valve housing l3, conduit ll between port I! in housing I: and orifice l2, conduit I! between port in housing I 3 and conduit l6, port I! in housing It, piston ll controlling ports 19 and 10, circumferential groove 2i in piston ll, compression spring- 22 tending to move valve it toward the right,. suction device 23 having suction chamber 24 connected with orifice in by conduit l6, diaphragm 25 connected to'circuit breaker plate 26 by rod 21, compression spring 28, ignition distributor cam 2!, circuit breaker ll.

It is understood that governor valve 8 can be automatically controlled by any of the well known governor t is automatically operated to controlthe engine at some desired governed speed.

The operation of my device is as follows: As shown, throttle valve 6 is in idle" position. Orifice ii is subjected to intake manifold vacuum which has drawn valve it to the left cutting of! port ltfrom suction device II. Suction chamber 24 is in communication through conduit It with orifice III which is substantially at atmospheric pressure so that the spark is retarded. If valve 6 is open slightly beyond idle position, orifice ii passes to the atmosphere side of valve 6 and spring 2| moves valve II to the right to now place suction chamber 24 in communication with orifice II which will cause the spark to advance. If carburetor throttle valve 8 is opened wide and the engine control taken over by valve l, then orifice I! will remain in-communication with suction chamber 24 and the spark will be controlled by pressure conditions obtaining at orifice I! as modified by the Vcnturi vacuum set up at orifice l0. While valve I8 is open, then as governor I moves toward closed position the intake passageway vacuum will increase but the full vacuum will not be imposed upon diaphragm 25 because orifice l0 now serves as an air bleed to orifice II. Also as governor 8 moves toward open position the intake passageway vacuum will drop but the velocity through venturi 5 will increase so that the Venturi suction created at orifice i! will prevent the vacuum in chamber 24 from dropping as low as the vacuum at orifice l2. Whenever valve 6 is closed, then the intake passageway suction moves valve it toward the left to cut off orifice I: from the suction device and spark advance is now controlled by the Venturi suction at orifice II.

I claim:

1. An ignition system for an internal combustion engine comprising an ignition timer, an intake passageway, a throttle valve in said intake passageway, a governor valve in said intake passageway on the engine side of said throttle valve, a device actuated by changes in pressure in the intake passageway for controlling the said timer to advance and retard the spark, an orifice in the intake passageway on the engine side of said governor valve, a conduit connecting said orifice with said pressure actuated device, a second orifice in said intake passageway on the engine side of said throttle valve when in idle position and on the atmosphere side of said throttle valve when partly open, a valve actuated by changes in pressure in the intake passageway for controlling fluid fiow through said first mentioned conduit, said pressure actuated valve being subjected on one side to atmospheric pressure and on the other side to the pressure obtaining at said second orifice',.a housing for said valve in communication with said second orifice whereby when the throttle valve is closed the intake passageway a 3 suction acts through said second orifice to close said valve and shut on communication between the first orifice and the pressure actuated device to retard the spark timing and a venturi in said intake passageway positioned on the atmosphere side of the throttle valve, a third orifice in the venturi and a conduit connecting the third orifice and said pressure actuated device whereby when said throttle valve is open said valve opens communication between the first orifice and the pressure actuated device so that the intake passageway pressures on the engine side of the governor valve as modified by the pressure obtaining at said third orifice are utilized to control the ignition timer.

2. An ignition system for an internal combus tion engine comprising an ignition timer, an intake passageway, a throttle valve in said intake passageway, a governor valve in said intake passageway on the engine side of said throttle valve, a device actuated by changes in pressure in the intake passageway for controlling the said timer to advance and retard the spark, an orifice in the intake passageway on the engine side of said governor valve, a conduit connecting said orifice with said pressure actuated device, a second orifice in said intake passageway on the engine side of said throttle valve when in idle position and on the atmosphere side of said throttle valve is closed the suction controlled valve means responds to intake passageway suction to close of! the first orifice from the pressure actuated device,

a venturi on the atmosphere side of the throttle 8. An ignition system for an internal combustion engine comprising an ignition timer, an intake passageway, a throttle valve in said intake passageway, a suction controlled device connected to said timer for advancing and retarding the spark, an orifice in the intake passageway positioned at all times on the atmosphere side of the throttle valve, a passageway connecting said orifice with the suction controlled device, a second orifice communicating with the engine side of the intake passageway when the throttle is in idletrolled device, and suction controlled valve valve, a third orifice in the venturi, and a conduit connecting the third orifice and said pressure actuated device whereby when the throttle valve is wide open the pressure actuated device will be controlled by the suction in the intake passage way on the engine side 01' the governor valve as modified by the pressure obtaining at the orifice in the venturi.

,, Number.

means in communication with said second orifice {or controlling communication between the third orifice and the suction controlled device, said suction controlled valve means being subject to atmospheric pressure on one side and on the other side to the pressure obtaining at said second orifice whereby when the throttle valve is in closed position the suction controlled valve means responds to intake passageway suction to shut oi! the third orifice from the suction controlled device and when the throttle valve is opened beyond idle position the suction controlled valve means responds to place the third orifice in communication with the suction controlled device whereby the suction in the intake passageway on the engine side or the governor valve is utilized toactuate the suction device for controlling th ignition timer.

1 MARION MAIL-CRY.

REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS Name Date Seymour Jan. 28,1941 Mallory Nov. 10, 1942 Mallory Aug. 7, 1945 

